Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c73570b26086d03…

MALICIOUS

PDF

50.7 KB Created: 2020-07-30 12:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 05eca3313ace647f83e5b4c73e157b85 SHA-1: b17ba577b2aeda362466321c5f7aaa4f775eca63 SHA-256: 8c73570b26086d03cd04ed034e9d21212f66d27a695c0b5742d3ae3303880148
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This indicates the document is designed to redirect users to malicious sites. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=free+academic+ielts+writing+task+1+sample+answers+pdf In PDF document text
    • http://files.paintedskyalpacafarm.com/uploads/1/3/1/6/131606965/woxodojuneb_tasaxenarom_merex_rifarobulaz.pdfIn PDF document text
    • http://files.theguardianofnature.org/uploads/1/3/1/4/131453429/najozedunipa.pdfIn PDF document text
    • http://files.allisonattitude.com/uploads/1/3/1/8/131872087/dudobikuluru.pdfIn PDF document text
    • http://files.blackburnlegal.com/uploads/1/3/1/4/131453170/9893178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/69923208146.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/17642396402.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/zojesaguza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5285/9543/files/8017165449.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/bexijefafitikekuvamiwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99203043279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4858/1782/files/18697402718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0711/4391/files/33073367819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/71097834638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/221014381.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0595/8565/files/55884520152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4658/4999/files/gewopusunuketibasos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85CD 5316 bytes
SHA-256: 3b076b5692b50ecc2789b6aaa0175920063ed40b9cec0b797e055b768a4bad0e
font_01_sfnt_off000097e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97E0 10888 bytes
SHA-256: d2e881fe4724658ac8a1b41444c46bc05cdc9cc3d18ef4980993f2b96e279b51

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